I'm not sure where this MaryEllen thing is coming from; I've never even mentioned her so I don't know why that conclusion has been jumped to. I compared her to Bitty who was selfish, self destructive, entitled and incredibly ungrateful because Marie in my opinion has exhibited that behavior. I also made comparison to a character from Bloodline because of the scheming to cause Will harm. Marie's behavior borders on girl bullying and the dismissive attitude that it's typical teen behavior and she'll grow out of it is what allows it to prevail.
Furthermore, Marie, who decided to positioned herself as some sort of moral proctor of Will over the Kyle thing, is way more judgmental than Claire was at the same age, not only that she lacks the kindness that Claire showed to others less fortunate than her (Mouse for example). She also lacks Claire sense of family loyalty which is why she is in this situation to begin with.
Unless there is something I'm not privy to yet I don't see Marie as being really all that different from the kids she is allegedly not conforming to...her clique is just dressed differently and has broader interests than the A&F crowd.